Synchronize

If the opponent causes a burn, paralysis, or poisoning of a Pokémon with Synchronize, the opponent receives the status condition too. Self-inflicted status conditions (for example through the use of an item) are not passed on.

In Generations 3-4, bad poison is only passed on as regular poison.

If a Pokémon with Synchronize is the leading party Pokémon, there is a 50% chance of each wild Pokémon encountered having the same nature.

Game descriptions

Ruby
Sapphire
FireRed
LeafGreen
Emerald
Passes on status problems.
Diamond
Pearl
Platinum
Passes on a burn, poison, or paralysis to the foe.
HeartGold
SoulSilver
Passes a burn, poison, or paralysis to the foe.
Black
White
Black 2
White 2
Passes a burn, poison, or paralysis to the foe.
X
Y
O.Ruby
A.Sapphire
Passes poison, paralyze, or burn to the Pokémon that inflicted it.
Sun
Moon
Ultra Sun
Ultra Moon
The attacker will receive the same status condition if it inflicts a burn, poison, or paralysis to the Pokémon.
Sword
Shield
B.Diamond
S.Pearl
The attacker will receive the same status condition if it inflicts a burn, poison, or paralysis to the Pokémon.

Other languages

EnglishSynchronize
SpanishSincronía
ItalianSincronismo
Japaneseシンクロ (Shinkuro)
GermanSynchro
FrenchSynchro